I think I'm getting closer, but maybe not quite there. Are you...
The reputation gained by answering to this riddle?
I am the Apple of this very country.
The Apple is referred as the fruit from the tree of knowledge, and the solution to riddles over here (this very country) is the knowledge we all desire.
Some sort of politeness we will all share, will we?
This refers to the "Be Nice" policy of SE sites.
Surprise itself is inferior to me.
We all want to know the answer, which will surprise us, but reputation is what we seek.
But for you, today, I am mostly irony.
Isn't it ironic that "reputation" gives you reputation?
Threaten me with your invisible bow and all my secrets I will reveal.
If you put the arrow-shaped cursor on a spoiler, you can see what's hidden.